2-stroke primed for a come back?

[steveyb]

http://www.tz250racing.com/cgi-bin/forums/ikonboard.cgi?;act=ST;f=2;t=6725;st=0;r=1;&#entry32048

[javawocky]

More Torque
More Power
More Efficiency
More Light
More Reliable
More Fun

I can't see the downside :woohoo:

I love the sound of a smoker, but will I miss the engine braking of the mighty V-twin and the lovely drown as you tap off? Mmm, hard one.:confused:

[xwhatsit]

Yeah but they won't be the two-strokes we all love. The whole point of the article seems to be saying how Orbital is going to build a two-stroke that goes like a four-stroke... only faster.

So no more smell and smoke. No more wildly outrageous peaky power that comes on in a rush and makes your heart beat faster.

Have a look at the dyno curves in the article... they compare a 450 4T to a 450 2T. The 2T is a little bit above the 4T (not by a huge amount though) and produces a fatter torque curve. They say they're going to use bigger capacities (4T-style capacities) and then tune it mildly.

So it's great of course. Like you said, more power, more torque, more efficient than a 4T... but it's not going to have quite the same appeal as an RD250LC.

[javawocky]

Don't forget that the weight of a 2 stroke is still lighter than the 4 stroke, so the thrill factor will still be higher.

I am sure with the savaging exhaust you are still going to get they typical sound. Not sure about the ringing and popping though.

As far as the smoke goes, I don't really care about that, I just like the performance :wari:

[xwhatsit]

As far as the smoke goes, I don't really care about that, I just like the performance :wari:
I'm slow and shit and the performance frightens me... so I just want the sound and smoke and the impression I'm a lunatic on a rocket :shit::woohoo:


Hear hear for the light weight, though. Maybe we'll finally see some interesting 125, 250 and 350 sport bikes again.

[nudemetalz]

hmmmm....I remember riding RZ & RG500's back in the '90s. :drool:
Won't be like them that had 4 pipes smoking and the shrieking exhaust note while trying to hang on to a light front end that's tank slapping all over the place.
Oh the memories !!

[Cleve]

hmmmm....I remember riding RZ & RG500's back in the '90s. :drool:
Won't be like them that had 4 pipes smoking and the shrieking exhaust note while trying to hang on to a light front end that's tank slapping all over the place.
Oh the memories !!

Ha ha. I have similar memories of riding an RG500 street bike in the late 80's and racing it around Bay Park...

[Shaun]

2 strokes are dead. Long live the half strokers

[Skunk]

2 strokes are dead. Long live the half strokers
Two strokers are for riders...

[Shaun]

Two strokers are for riders...


Good luck in the modern world then

[malcy25]

If 4 strokes are the wife, 2 strokes are the mistress!

[Maido]

2 strokes are dead. Long live the half strokers

^^^^ this!

[CookMySock]

With modern oils, no 2 stroke should piss smoke everywhere anyway.. thats just a carry-over from days gone by, when if it DIDN'T piss smoke everywhere, you had forgot to mix the oil in the fuel.. Running 100:1 Amsoil I get NO smoke at any time, bar none. Most people are horrified - it's great. :laugh:

Steve

[Skunk]

Good luck in the modern world then
Just like 5 valve heads ready. They first come out in 1913 or so didn't they?
Modern. Pah. Nothing is modern.

[svr]

Two strokers are for riders...

Not just any riders - High Siders

[RDjase]

I just got out the dyno charts from from old LC (stock engine) looks great the torque and power curve matching lol, thats were the fun is ;-) old strokes kick arse, i dont even like YPVS engines that much , smoothing out the power , what a stupid idea lol ,Pre 82 Post Classics Rule ! ! !

[eelracing]

I just got out the dyno charts from from old LC (stock engine) looks great the torque and power curve matching lol, thats were the fun is ;-) old strokes kick arse, i dont even like YPVS engines that much , smoothing out the power , what a stupid idea lol ,Pre 82 Post Classics Rule ! ! !


Damn straight,totally agree and YPVS was invented so 4 stroke riders could learn to ride em.

[Drew]

Only got through a couple paragraphs, and stopped reading the bullshit.

Modern four strokes are "peaky"? To get more power you lose torque?

Ride my race bike, ya cant get anywhere near full throttle till it's reving, because the MASSIVE amount of torque between 6 and 10,000 rpm just points the front wheel skyward.

A poorly investigated write up, full of holes and half truths.

[Badjelly]

With modern oils, no 2 stroke should piss smoke everywhere anyway.. thats just a carry-over from days gone by, when if it DIDN'T piss smoke everywhere, you had forgot to mix the oil in the fuel.. Running 100:1 Amsoil I get NO smoke at any time, bar none.

Agreed, modern two-stroke oils reduce visible smoke. What they don't reduce is the unburned petrol that comes out of a two-stroke, about 20-30% of what went in. Direct fuel injection can eliminate that, too, and is used on outboard motors, but as I understand it, direct-injected two-strokes to date (Bimoto V-due) have had a very abrupt power delivery that makes them unsuitable for motorbikes. The Orbital fuel injection system is supposed to avoid that problem. I wish them luck, but I'll wait until they've actually built one before I'm convinced.

[Patch]

A poorly investigated write up, full of holes and half truths.
must've been written by a kb'er in disguise